Reflector structure and antenna device

ABSTRACT

A reflector structure is configured to connect an antenna. The antenna has an excitation source. The reflector structure includes a metal substrate, at least one first flat plate and a second flat plate. The metal substrate is configured to reflect the radiation of the antenna. The at least one first flat plate is disposed on the metal substrate. The second flat plate is floated to the metal substrate along a virtual normal and completely separated from the at least one first plate to form a closed slot. A cavity is formed by the metal substrate, the at least one first flat plate and the second flat plate and communicated with the closed slot. The excitation source is projected onto a plane to form an excitation source region. The excitation source region is located in the second flat plate.

RELATED APPLICATIONS

This application claims priority to Taiwan Application Serial Number109125869, filed Jul. 30, 2020, which is herein incorporated byreference.

BACKGROUND Technical Field

The present disclosure relates to a reflector structure and an antennadevice. More particularly, the present disclosure relates to a reflectorstructure having a closed slot and a cavity and an antenna devicethereto.

Description of Related Art

In recent years, a wireless network becomes more developed andwidespread. The wireless network is everywhere no matter in a publicspace, educational place, or a house. With the advent of the 5thGeneration Mobile Networks (5G), the demand for high gain antennas isincreased. In order to increase the antenna gain, the conventional artuses an additional structure to increase the reflection efficiency ofthe antenna, but it also increases the overall volume of the antenna andcauses inconvenience in assembly.

Due to the limitation of the physical size of the antenna, the antennaoften needs a certain amount of space to achieve high gaincharacteristics. With existing products heading towards miniaturization,end customers hope to further reduce the size of the antenna.

In view of this, how to reduce the height and the overall volume of theantenna, and maintain excellent antenna performance for the problems ofthe above-mentioned antenna becomes the goal of the public and relevantindustry efforts.

SUMMARY

According to an embodiment of the present disclosure, a reflectorstructure is configured to reflect a radiation of an antenna having anexcitation source. The reflector structure includes a metal substrate,at least one first flat plate and a second flat plate. The metalsubstrate is configured to reflect the radiation of the antenna, and acenter of the metal substrate has a virtual normal. The at least onefirst flat plate is disposed on the metal substrate. The second flatplate is floated to the metal substrate along the virtual normal, andcompletely separated from the at least one first plate to form a closedslot. A cavity is formed by the metal substrate, the at least one firstflat plate and the second flat plate, and communicated with the closedslot. The closed slot is located on a plane, the excitation source isprojected onto the plane to form an excitation source region, and theexcitation source region is located in the second flat plate.

According to another embodiment of the present disclosure, an antennadevice includes an antenna structure and a reflector structure. Theantenna structure has at least one excitation source. The reflectorstructure is configured to reflect a radiation of the antenna structure.The reflector structure includes a metal substrate, at least one firstflat plate and a second flat plate. The metal substrate has a virtualnormal. The at least one first flat plate is disposed on the metalsubstrate. The second flat plate is floated to the metal substrate alongthe virtual normal, and completely separated from the at least one firstplate to form a closed slot. A cavity is formed by the metal substrate,the at least one first flat plate and the second flat plate, andcommunicated with the closed slot. The closed slot is located on aplane, the at least one excitation source is projected onto the plane toform an excitation source region, and the excitation source region islocated in the second flat plate.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1 is a three-dimensional schematic view of a reflector structureaccording to the 1st embodiment of a structural aspect of the presentdisclosure.

FIG. 2 is an exploded view of the reflector structure of FIG. 1.

FIG. 3 is a three-dimensional schematic view of a reflector structureaccording to the 2nd embodiment of the structural aspect of the presentdisclosure.

FIG. 4 is an exploded view of the reflector structure of FIG. 3.

FIG. 5 is a three-dimensional schematic view of an antenna deviceaccording to the 3rd embodiment of another structural aspect of thepresent disclosure.

FIG. 6 is an exploded view of the antenna device of FIG. 5.

FIG. 7 is a three-dimensional schematic view of an antenna deviceaccording to the 4th embodiment of the another structural aspect of thepresent disclosure.

FIG. 8 is a top view of the antenna device of FIG. 5.

FIG. 9 is a measurement diagram of a peak gain of an antenna structurecorresponding to different first widths and second widths of FIG. 5.

FIG. 10 is a measurement diagram of S11 parameters of the antennastructure corresponding to different heights of FIG. 5.

FIG. 11 is a measurement diagram of peak gains of the antenna structurecorresponding to different reflectors and distances of FIG. 5.

FIG. 12 is a measurement diagram of S11 parameters of the antennastructure corresponding to different reflectors and distances of FIG. 5.

FIG. 13A is a Smith chart of S11 parameters of the antenna structurecorresponding to different reflectors and distances of FIG. 5.

FIG. 13B is another Smith chart of S11 parameters of the antennastructure corresponding to different reflectors and distances of FIG. 5.

DETAILED DESCRIPTION

The embodiment will be described with the drawings. For clarity, somepractical details will be described below. However, it should be notedthat the present disclosure should not be limited by the practicaldetails, that is, in some embodiment, the practical details isunnecessary. In addition, for simplifying the drawings, someconventional structures and elements will be simply illustrated, andrepeated elements may be represented by the same labels.

It will be understood that when an element (or device) is referred to asbe “connected to” another element, it can be directly connected to theother element, or it can be indirectly connected to the other element,that is, intervening elements may be present. In contrast, when anelement is referred to as be “directly connected to” another element,there are no intervening elements present. In addition, the terms first,second, third, etc. are used herein to describe various elements orcomponents, these elements or components should not be limited by theseterms. Consequently, a first element or component discussed below couldbe termed a second element or component. Besides, a combination of theseelements (unite or circuits) of the present closure is not a commoncombination in this art, so it cannot be predicted whether a relation ofthe combination hereof can be easily done by a person having skill inthe art by these elements (units or circuits).

Please refer to FIGS. 1 and 2. FIG. 1 is a three-dimensional schematicview of a reflector structure 100 according to the 1st embodiment of astructural aspect of the present disclosure; and FIG. 2 is an explodedview of the reflector structure 100 of FIG. 1. The reflector structure100 is connected to an antenna structure, and configured to reflect aradiation of the antenna structure having an excitation source.

In FIGS. 1 and 2, the reflector structure 100 includes at least onefirst flat plate 110, a second flat plate 120 and a metal substrate 130.The metal substrate 130 is mainly configured to reflect the radiation ofthe antenna, and a center of the metal substrate 130 has a virtualnormal L. The at least one first flat plate 110 is disposed on the metalsubstrate 130. The second flat plate 120 is floated to the metalsubstrate 130 along the virtual normal L, and completely separated fromthe at least one first plate 110 to form a closed slot 140. In specific,the reflector structure 100 can further include a support element 150which is disposed between the second flat plate 120 and the metalsubstrate 130 to support and prop against the second flat plate 120.

Specifically, a cavity 160 is formed by the metal substrate 130, the atleast one first flat plate 110 and the second flat plate 120, andcommunicated with the closed slot 140. The closed slot 140 is located ona plane (its reference numeral is omitted). The excitation source isprojected onto the plane to form an excitation source region (that is,the position of the excitation source in the plane of the closed slot140), and the excitation source region is located in the second flatplate 120. Further, the at least one first flat plate 110, the secondflat plate 120 and the closed slot 140 can be located on the plane.Therefore, the reflector structure 100 of the present disclosure can beapplied to a metal reflector of the antenna, and can change theradiation path of the antenna through the closed slot 140 and the cavity160 so as to increase an antenna gain. Further, it is worth noting thatthe closed slot 140 of FIG. 1 is rectangular, and can also be circularor polygonal, but the present disclosure is not limited thereto.

Please refer to FIGS. 3 and 4. FIG. 3 is a three-dimensional schematicview of a reflector structure 200 according to the 2nd embodiment of thestructural aspect of the present disclosure; and FIG. 4 is an explodedview of the reflector structure 200 of FIG. 3. As the figures show, anumber of the at least one first flat plate 210 is plural. The metalsubstrate 230 includes a substrate 231, a metal layer 232 and a metalloop 233. The substrate 231 has a surface (its reference numeral isomitted). The metal layer 232 is disposed on the surface of thesubstrate 231 to reflect the radiation emitted by the antenna. The metalloop 233 is disposed between an outer periphery edge of the metal layer232 and each of the first flat plates 210. It should be noted that themetal loop 233 and each of the first flat plates 210 can be separatedfrom each other or formed integrally, and the cavity 260 is formed bythe metal layer 232, the metal loop 233, each of the first flat plates210 and the second flat plate 220.

In detail, the substrate 231 and the metal layer 232 can also be formedintegrally, and a thickness (its reference numeral is omitted) of thesubstrate 231 and the metal layer 232 is only about a few millimeters soas to minimize the volume of the reflector structure 200 which appliesto the current network communication product. Furthermore, the cavity260 is located between the metal layer 232 and the first flat plates210, and is a space covered by the metal loop 233; in other words, thecavity 260 of the 2nd embodiment of FIG. 3 and the cavity 160 of the 1stembodiment of FIG. 1 is the same. Moreover, the reflector structure 200can further include a support element 250 which is connected between thesecond flat plate 220 and the metal substrate 230 to support and propagainst the second flat plate 220. A height of the support element 250is the same as a height of the metal loop 233, so that the second flatplate 220 and each of the first flat plates 210 can be located on thesame horizontal plane. Furthermore, each of the first flat plates 210 isarranged at intervals along the metal loop 233. A slot 270 is locatedbetween each two of the first flat plates 210, and each of the slots 270of the reflector structure 200 is connected to the closed slot 240,respectively, and the cavity 260 is communicated with the closed slot240 and all of the slots 270. As the 2nd embodiment of FIG. 3 shows, theclosed slot 240 and each of the slots 270 are connected to each other ina grillage type, and the closed slot 240 and each of the slots 270 havethe same width. However, in other embodiments, the width of the closedslot 240 and the width of each of the slots 270 can be different, so thepresent disclosure is not limited thereto.

Therefore, the reflector structure 200 of the present disclosure can beapplied to the metal reflector of the antenna, and extends the radiationpath of the antenna through the closed slot 240, each of the slots 270and the cavity 260 to achieve high gain characteristics.

Please refer to FIGS. 5 and 6. FIG. 5 is a three-dimensional schematicview of an antenna device 300 according to the 3rd embodiment of anotherstructural aspect of the present disclosure; and FIG. 6 is an explodedview of the antenna device 300 of FIG. 5. As the figures show, theantenna device 300 includes an antenna structure 400 and a reflectorstructure 500. The reflector structure 500 is configured to reflect aradiation emitted by the antenna structure 400. In specific, the antennastructure 400 includes a first antenna element 410, a second antennaelement 420 and an antenna substrate 430. The antenna substrate 430 hasa first surface 431 and a second surface 432 opposite to the firstsurface 431. The first antenna element 410 is disposed on the firstsurface 431, and the second antenna element 420 is disposed on thesecond surface 432.

In detail, the antenna structure 400 has two excitation sources 411, 421(that is, the first antenna element 410 has the excitation source 411,and the second antenna element 420 has the excitation source 421), andeach of the excitation sources 411, 421 includes a feeding end F and agrounding end G. The first antenna element 410 can be a dipole antenna,which includes a first radiation element 4101 and a second radiationelement 4102. The feeding end F of the excitation source 411 isconnected to the first radiation element 4101, and the grounding end Gof the excitation source 411 is connected to the second radiationelement 4102. The second antenna element 420 can also be another dipoleantenna, which includes a first radiation element 4201 and a secondradiation element 4202. The feeding end F of the excitation source 421is connected to the first radiation element 4201, and the grounding endG of the excitation source 421 is connected to the second radiationelement 4202. Further, in FIG. 5, the first antenna element 410 and thesecond antenna element 420 are a dual-polarization dipole antenna, and apolarization of the first antenna element 410 and a polarization of thesecond antenna element 420 are orthogonal to each other.

More detail, the reflector structure 500 is vertically disposed on theantenna structure 400, and includes at least one first flat plate 510, asecond flat plate 520 and a metal substrate 530. The metal substrate 530is configured to reflect the radiation of the first antenna element 410and the second antenna element 420, and a center of the metal substrate530 has a virtual normal I. The at least one first flat plate 510 isdisposed on the metal substrate 530. The second flat plate 520 isfloated to the metal substrate 530 along the virtual normal, andcompletely separated from the at least one first plate 510 to form aclosed slot 540. In addition, the antenna device 300 can further includea support element 550 which is disposed between the second flat plate520 and the metal substrate 530 to support the second flat plate 520. Itis worth explaining that, a cavity 560 is formed by the metal substrate530, the at least one first flat plate 510 and the second flat plate520, and communicated with the closed slot 540. It is worth noting that,the closed slot 540 is located on a plane (its reference numeral isomitted), and the excitation sources 411, 421 are projected onto theplane to form two excitation source regions, respectively. Theexcitation source regions are located in the second flat plate 520.Further, the at least one first flat plate 510, the second flat plate520 and the closed slot 540 can be located on the plane.

Therefore, the antenna device 300 of the present disclosure changes theradiation path of emitted from the excitation source 411 and the anotherexcitation source 421 through the closed slot 540 and the cavity 560 ofthe reflector structure 500 so as to maintain excellent antennaimpedance matching and high gain radiation characteristics.

In specific, as FIGS. 5 and 6 show, a number of the at least one firstflat plate 510 can be plural, and the antenna device 300 can furtherinclude a plurality of supporting pillars 600. The supporting pillars600 are disposed between the antenna substrate 430 and the second flatplate 520. In other embodiment, each of the supporting pillars 600 canalso be disposed between the antenna substrate 430 and each of four ofthe first flat plates 510 to prop against the antenna structure 400.

Moreover, the metal substrate 530 includes a substrate 531, a metallayer 532 and a metal loop 533. The substrate has a surface (itsreference numeral is omitted). The metal layer 532 is disposed on thesurface to reflect the radiation of the first antenna element 410 andthe second antenna element 420. The metal layer 532 can be a generalmetal material and attached to the substrate 531 through a coatingprocess technology. The metal loop 533 is disposed between an outerperiphery edge of the metal layer 532 and each of the first flat plates510. Therefore, the cavity 560 is formed by the metal layer 532, themetal loop 533, each of the first flat plates 510 and the second flatplate 520.

FIG. 7 is a three-dimensional schematic view of an antenna device 300 aaccording to the 4th embodiment of the another structural aspect of thepresent disclosure. In the 4th embodiment of FIG. 7, the arrangementbetween the reflector structure 500 a and the supporting pillars 600 ais the same as the corresponding elements in the 3rd embodiment of FIG.5, and will not be detailedly described herein. As FIG. 7 shows, theantenna structure 400 a can include a first antenna element 410 a, asecond antenna element 420 a and an antenna substrate 430 a. The firstantenna element 410 a and the second antenna element 420 a can be abroadband antenna.

In addition, the antenna substrate 430 a has a first surface 431 a and asecond surface 432 a opposite to the first surface 431 a. The firstantenna element 410 a includes a first radiation element 4101 a and asecond radiation element 4102 a. The second antenna element 420 aincludes a first radiation element 4201 a and a second radiation element4202 a. In particular, the first radiation element 4101 a of the firstantenna element 410 a and the first radiation element 4201 a of thesecond antenna element 420 a are both disposed on the first surface 431a. The second radiation element 4102 a of the first antenna element 410a and the second radiation element 4202 a of the second antenna element420 a are both disposed on the second surface 432 a. The first radiationelement 4101 a and the second radiation element 4102 a of the firstantenna element 410 a are disposed on different surfaces, respectively.The first radiation element 4101 a and the second radiation element 4102a can be connected to each other through a feeding end F and a groundingend G of the excitation source 411 a. Similarly, the first radiationelement 4201 a and the second radiation element 4202 a of the secondantenna element 420 a are disposed on different surfaces, respectively.The first radiation element 4201 a and the second radiation element 4202a can be connected to each other through a feeding end F and thegrounding end G of the excitation source 421 a.

Please refer to FIGS. 5 to 8. FIG. 8 is a top view of the antenna device300 of FIG. 5. In detail, each of the first flat plates 510 is arrangedat intervals along the metal loop 533. A slot 570 is located betweeneach two of the first flat plates 510, and each of the slots 570 isconnected to the closed slot 540. In more detail, the closed slot 540can has a first width W1, each of the slots 570 has a second width W2,and the first width W1 and the second width W2 are both greater than orequal to 2 mm and less than or equal to 14 mm, that is, the first widthW1 and the second width W2 are between 2 mm to 14 mm, but the presentdisclosure is not limited thereto. It is worth noting that, the closedslot 540 and each of the slots 570 are connected to each other in agrillage type, and the closed slot 540 has the same width as each of theslots 570 in the 3rd embodiment. However, in other embodiments, thewidth of the closed slot 540 and each of the slots 570 can be different,so the present disclosure is not limited thereto.

FIG. 9 is a measurement diagram of a peak gain of the antenna structure400 corresponding to different first widths W1 and second widths W2 ofFIG. 5. In FIG. 9, the antenna structure 400 can be operable in anoperating band and corresponds to the peak gain of the operating bandaccording to the first width W1 and the second width W2. When the firstwidth W1 and the second width W2 are increased, the peak gain of theantenna structure 400 is increased.

Please refer to FIGS. 5 and 10. FIG. 10 is a measurement diagram of S11parameters of the antenna structure 400 corresponding to differentheights of FIG. 5. The cavity 560 has a height H which is greater thanor equal to 6 mm and less than or equal to 14 mm, that is, the height Hof the cavity 560 is between 6 mm and 14 mm, but the present disclosureis not limited thereto.

In FIG. 10, the antenna structure 400 based on the S11 parameter=−6 dBcorresponds to the operating band according to the height H. When theheight H is increased, the operating band is decreased. In detail, theheight H of the cavity 560 is the height of the metal loop 533, and thereflector structure 500 of the present disclosure can correspond to thedifferent operating bands according to the different heights H. Forexample, when the antenna structure 400 is the dual-polarization dipoleantenna, the operating band is between 0.7 GHz and 1 GHz; when theantenna structure 400 is the broadband antenna, the operating band isbetween 1700 MHz and 2700 MHz, and the dual-polarization dipole antennaand the broadband antenna are the conventional arts and not the focus ofthe present disclosure, and will not be detailedly described herein.

Please refer to FIGS. 5 and 11 to 13B. FIG. 11 is a measurement diagramof peak gains of the antenna structure 400 corresponding to differentreflectors and distances D of FIG. 5; FIG. 12 is a measurement diagramof S11 parameters of the antenna structure 400 corresponding todifferent reflectors and distances D of FIG. 5; FIG. 13A is a Smithchart of S11 parameters of the antenna structure 400 corresponding todifferent reflectors and distances D of FIG. 5; and FIG. 13B is anotherSmith chart of S11 parameters of the antenna structure 400 correspondingto different reflectors and distances D of FIG. 5. In FIG. 5, a distanceD (i.e., the height of each of the supporting pillars 600) is disposedbetween the antenna structure 400 and the reflector structure 500, andthe distance is between 0.1 to 0.2 times of a wavelength in a centerfrequency of the operating band, but the present disclosure is notlimited thereto.

As FIGS. 11 to 13B show, when the distance D between the reflectorstructure 500 and the antenna structure 400 is compared with thedistance between a general antenna and a conventional reflector, theantenna device 300 of the present disclosure can maintain excellentantenna impedance matching (i.e., having better S11 parameters), highgain radiation characteristics (i.e., having higher peak gain) andbetter front-to-back ratio (F/B ratio) at the same length (e.g., 45 mm).Therefore, the overall height of the antenna device 300 is smaller thanthe overall height of the conventional antenna by ⅛ wavelength throughoverlapping the reflector structure 500 and the antenna structure 400.

As shown in the aforementioned embodiments, the present disclosure hasthe following advantages. First, the antenna device can not only beapplied to various antenna structures, but can also achieve the effectof improving peak gain by adjusting the first width and the second widthof the reflector structure. Second, it is favorable for reducing theoverall height of the antenna device with the reflector structure of thepresent disclosure so as to reduce the volume. Third, the reflectorstructure and the antenna device have simple structure, low productioncost, and suitable for the application of the current networkcommunication product.

Although the present disclosure has been described in considerabledetail with reference to certain embodiments thereof, other embodimentsare possible. Therefore, the spirit and scope of the appended claimsshould not be limited to the description of the embodiments containedherein.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the structure of the presentdisclosure without departing from the scope or spirit of the disclosure.In view of the foregoing, it is intended that the present disclosurecover modifications and variations of this disclosure provided they fallwithin the scope of the following claims.

What is claimed is:
 1. A reflector structure configured to reflect aradiation of an antenna having an excitation source, the reflectorstructure comprising: a metal substrate configured to reflect theradiation of the antenna, wherein a center of the metal substrate has avirtual normal; at least one first flat plate disposed on the metalsubstrate; and a second flat plate floated to the metal substrate alongthe virtual normal and completely separated from the at least one firstplate to form a closed slot; wherein a cavity is formed by the metalsubstrate, the at least one first flat plate and the second flat plate,and the cavity is communicated with the closed slot; wherein the closedslot is located on a plane, the excitation source is projected onto theplane to form an excitation source region, and the excitation sourceregion is located in the second flat plate.
 2. The reflector structureof claim 1, wherein the at least one first flat plate, the second flatplate and the closed slot are located on the plane.
 3. The reflectorstructure of claim 1, wherein the reflector structure further comprises:a support element disposed between the second flat plate and the metalsubstrate to support the second flat plate.
 4. The reflector structureof claim 1, wherein the metal substrate comprises: a substrate having asurface; a metal layer disposed on the surface of the substrate toreflect the radiation of the antenna; a metal loop disposed between anouter periphery edge of the metal layer and the at least one first flatplate; wherein the cavity is formed by the metal layer, the metal loop,the at least one first flat plate and the second flat plate.
 5. Thereflector structure of claim 4, wherein a number of the at least onefirst flat plate is plural, each of the first flat plates is arranged atintervals along the metal loop, a slot is located between each two ofthe first flat plates, and each of the slots is connected to the closedslot, respectively.
 6. The reflector structure of claim 5, wherein theclosed slot and each of the slots are connected to each other in agrillage type.
 7. The reflector structure of claim 5, wherein the closedslot has a first width, each of the slots has a second width, and thefirst width and the second width are both greater than or equal to 2 mmand less than or equal to 14 mm.
 8. An antenna device, comprising: anantenna structure having at least one excitation source; and a reflectorstructure configured to reflect a radiation of the antenna structure,wherein the reflector structure comprises: a metal substrate having avirtual normal; at least one first flat plate disposed on the metalsubstrate; and a second flat plate floated to the metal substrate alongthe virtual normal and completely separated from the at least one firstplate to form a closed slot; wherein a cavity is formed by the metalsubstrate, the at least one first flat plate and the second flat plate,and the cavity is communicated with the closed slot; wherein the closedslot is located on a plane, the at least one excitation source isprojected onto the plane to form an excitation source region, and theexcitation source region is located in the second flat plate.
 9. Theantenna device of claim 8, wherein the antenna structure comprises: anantenna substrate having a first surface and a second surface; a firstantenna element disposed on one of the first surface and the secondsurface; and a second antenna element disposed on another one of thefirst surface and the second surface; wherein the antenna structure is adual-polarization dipole antenna or a broadband antenna.
 10. The antennadevice of claim 9, wherein the antenna device further comprises: aplurality of supporting pillars, wherein each of the supporting pillarsis disposed between the antenna substrate and the at least one firstflat plate or the second flat plate for supporting the antennasubstrate, respectively.
 11. The antenna device of claim 8, wherein theantenna device further comprises: a supporting element is disposedbetween the second flat plate and the metal substrate for supporting thesecond flat plate.
 12. The antenna device of claim 8, wherein the metalsubstrate comprises: a substrate having a surface; a metal layerdisposed on the surface of the substrate to reflect the radiation of theantenna structure; a metal loop disposed between an outer periphery edgeof the metal layer and the at least one first flat plate; wherein thecavity is formed by the metal layer, the metal loop, the at least onefirst flat plate and the second flat plate.
 13. The antenna device ofclaim 12, wherein a number of the at least one first flat plate isplural, each of the first flat plates is arranged at intervals along themetal loop, a slot is located between each two of the first flat plates,and each of the slots is connected to the closed slot, respectively. 14.The antenna device of claim 13, wherein the closed slot and each of theslots are connected to each other in a grillage type.
 15. The antennadevice of claim 13, wherein the closed slot has a first width, each ofthe slots has a second width, and the first width and the second widthare both greater than or equal to 2 mm and less than or equal to 14 mm.16. The antenna device of claim 15, wherein the antenna structure isoperable in an operating band and corresponds to a peak gain of theoperating band according to the first width and the second width, whenthe first width and the second width are increased, the peak gain isincreased.
 17. The antenna device of claim 8, wherein the antennastructure is operable in an operating band, a distance is disposedbetween the antenna structure and the reflector structure, and thedistance is between 0.1 to 0.2 times of a wavelength in a centerfrequency of the operating band.
 18. The antenna device of claim 8,wherein the cavity has a height, the antenna structure corresponds to anoperating band according to the height, when the height is increased,the operating band is decreased.
 19. The antenna device of claim 9,wherein the antenna structure is operable in an operating band, when theantenna structure is the dual-polarization dipole antenna, the operatingband is between 0.7 GHz and 1 GHz.
 20. The antenna device of claim 9,wherein the antenna structure is operable in an operating band, when theantenna structure is the broadband antenna, the operating band isbetween 1700 MHz and 2700 MHz.